EP3626478B1 - Surface gaufrée par voie numérique en registre - Google Patents

Surface gaufrée par voie numérique en registre Download PDF

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Publication number
EP3626478B1
EP3626478B1 EP19208901.9A EP19208901A EP3626478B1 EP 3626478 B1 EP3626478 B1 EP 3626478B1 EP 19208901 A EP19208901 A EP 19208901A EP 3626478 B1 EP3626478 B1 EP 3626478B1
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EP
European Patent Office
Prior art keywords
ink
matrix
digital
print
embossed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19208901.9A
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German (de)
English (en)
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EP3626478A1 (fr
Inventor
Darko Pervan
Tony Pervan
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Ceraloc Innovation AB
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Ceraloc Innovation AB
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Publication of EP3626478A1 publication Critical patent/EP3626478A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C5/00—Processes for producing special ornamental bodies
    • B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0064—Digital printing on surfaces other than ordinary paper on plastics, horn, rubber, or other organic polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/007—Digital printing on surfaces other than ordinary paper on glass, ceramic, tiles, concrete, stones, etc.
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0076—Digital printing on surfaces other than ordinary paper on wooden surfaces, leather, linoleum, skin, or flowers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/24—Pressing or stamping ornamental designs on surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C3/00—Processes, not specifically provided for elsewhere, for producing ornamental structures
    • B44C3/02—Superimposing layers
    • B44C3/025—Superimposing layers to produce ornamental relief structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C5/00—Processes for producing special ornamental bodies
    • B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers
    • B44C5/0469—Ornamental plaques, e.g. decorative panels, decorative veneers comprising a decorative sheet and a core formed by one or more resin impregnated sheets of paper
    • B44C5/0476—Ornamental plaques, e.g. decorative panels, decorative veneers comprising a decorative sheet and a core formed by one or more resin impregnated sheets of paper with abrasion resistant properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2471/00—Floor coverings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/10—Flooring or floor layers composed of a number of similar elements of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite tiles, hardboard, or with a top layer of other materials
    • E04F15/102—Flooring or floor layers composed of a number of similar elements of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite tiles, hardboard, or with a top layer of other materials of fibrous or chipped materials, e.g. bonded with synthetic resins

Definitions

  • the disclosure generally relates to the field of panels with a decorative wear resistant surface, preferably floor and wall panels.
  • the invention relates to production methods to produce such panels.
  • Embodiments of the present invention are particularly suitable for use in floors, which may be formed of floor panels comprising a core, a decorative layer and a transparent wear resistant structured layer above the decorative layer.
  • floors which may be formed of floor panels comprising a core, a decorative layer and a transparent wear resistant structured layer above the decorative layer.
  • embodiments of the invention may be used to produce a surface layer in any type of panels, for example in building panels such as wall panels, ceilings, and furniture components and similar.
  • the method may be used to form embossed structures in wood floors, vinyl based floors such as so-called LVT floors and ceramic tiles.
  • DPL Direct Pressed Laminated
  • the surface layer of a laminate floor is characterized in that the decorative and wear properties are generally obtained with two separate layers of paper, one above the other.
  • the decorative layer is generally a printed paper and the wear layer is a transparent overlay paper, which comprises small aluminium oxide particles.
  • the printed decorative paper and the overlay are impregnated with melamine formaldehyde resins and laminated to a HDF core in large laminate presses where the resin cures under high heat (160-200 degrees Celsius) and pressure and the papers are laminated to the core material.
  • An embossed press plate forms the surface structure.
  • a structured paper is used as a press matrix.
  • Laminated floors may also be produced with printing technology.
  • One advantage is that the pressing operation may be avoided and that no printed papers are needed to provide a decorative wear resistance surface.
  • Floor panels with a Direct Printed Laminate surface comprise the same type of HDF core as DPL.
  • the décor is printed directly onto the core.
  • the production process is rather complicated and is only cost efficient in very large production volumes.
  • Hydro printing inks are used to print the décor by a multicolour printing press with rollers that print directly onto the pre-sealed core.
  • the printed décor layer must be protected against wear.
  • the most common method to achieve high abrasive strength is to use, anti-abrasive UV sealers, which are applied on the print by rollers and cured by UV light.
  • Embossed structures may be formed by embossed rollers.
  • Direct printing technology may be replaced with Digital printing Technology that is much more flexible and small production volumes can be economically manufactured.
  • the difference between these two methods is mainly the printing step where printing rollers are replaced by a digital non-contact printing process and where the desired image is directly applied on to the pre-finished core.
  • the final transparent coating which protects the digital image and the structured surfaces are usually of the same type as used in direct printing. Any types or printed images may be created but the surface structure is always limited to the form of the embossed rollers or structured films that are pressed against the surface.
  • Digital printing may also be used to print on a paper sheet that is used in conventional laminate production.
  • the print may be applied on a separate impregnated or non-impregnated paper that, after printing, is applied on a core.
  • a raw paper may also be applied on a core comprising a resin that, during pressing, penetrates into the raw paper. The main advantage is that impregnation and very accurate positioning of the paper may be avoided.
  • the powder mix may comprise aluminium oxide particles, melamine formaldehyde resins and wood fibres.
  • decorative particles such as, for example colour pigments are included in the mix.
  • all these materials are applied in dry form as a mixed powder on a HDF core and cured under heat and pressure to a 0.1 - 1.0 mm solid layer.
  • Melamine formaldehyde resin and wood fibres may be replaced by thermoplastic particles.
  • Powder technology is very suitable to produce a decorative surface layer, which is a copy of stone and ceramics. It is however more difficult to create designs such as, for example wood decors.
  • recently digital powder printing has been developed and it is possible to create very advanced designs of any type by injecting a digital print into the powder prior to pressing.
  • the surface structure is made in the same way as for laminate flooring by a structured press plate or an embossed matrix paper that is pressed against the powder.
  • Floors with a surface of wood are produced in many different ways.
  • Traditional solid wood floors have developed into engineered floors with wood layers applied on a core made of wood lamellas, HDF or plywood. The majority of such floors are delivered as pre finished floors with a wood surface that is coated with several transparent layers in the factory.
  • Recently wood floorings have also been produced with a digitally printed pattern that improves the design of the wood grain structure in wood species that do not have a sufficient surface quality.
  • embossed surface structure especially when the decorative printed décor is a wood pattern.
  • the embossed structure was in the past provided as a separate general structure type that was used for many different décor types.
  • Recently most floor producers have introduced the so-called Embossed In Register (EIR) method where the embossed surface structure is specifically formed for each type of wood species and the embossing is made in register with the printed décor.
  • EIR Embossed In Register
  • Embossed surfaces are an essential part of the surface structure and design and it would be an advantage if such structures may be formed in a more flexible and cost efficient way.
  • the visible surface of the installed floor panel is called “front side”
  • the opposite side of the floor panel, facing the sub floor is called “rear side”.
  • surface layer are meant all layers which give the panel its decorative properties and its wear resistance and which are applied to the core closest to the front side covering preferably the entire front side of the floorboard.
  • print is meant a décor, design, pattern or image.
  • up is meant towards the front side and by “down” towards the rear side.
  • vertical is meant perpendicular to the surface and by “horizontally” parallel to the surface.
  • pigmentsfor digital print ink is meant a material that changes the colour of reflected or transmitted light as the result of wavelength-selective absorption.
  • dye ink is meant a coloured substance that has an affinity to the substrate to which it is being applied.
  • the dye is generally applied in an aqueous solution, which also may contain a binder, and may require a mordant to improve the fastness of the dye on the fibre.
  • a dye is completely soluble like sugar in water.
  • aqueous or water based ink is meant an ink where water is used as liquid substance in the ink.
  • the water-based liquid carries the pigments.
  • a binder is present in the system as well to bind the pigments to the substrate.
  • solvent based ink ink that generally contains three major parts such as a fluid carrier, pigments and resins.
  • solvent ink refers generally only to the oil-based carrier portion of the ink that keeps the other components in liquid form and once applied to a surface through jetting evaporates.
  • UV curable inks of coating ink or coating that after application is cured by exposure to strong UV-light in an UV oven.
  • matrix is meant a material that forms an embossed surface structure when the material is pressed against a surface.
  • matrix ink is meant a curable ink or coating substance that when applied, cured and pressed against a substrate creates a depression in the substrate.
  • ink matrix is meant a press matrix formed by the mat ink substance that is cured to a hard structure such that it may create depressions in a surface during pressing.
  • digital coating is meant a digital application of a curable ink by a digital ink head.
  • Embossed In Register or EIR means that a printed décor is in register with an embossed structure.
  • Digital Variable Embossed In Register DVEIR, means that the embossed in register is partly or completely created digitally and varies in register with the variation of the printed décor.
  • High definition digital printers use a non-impact printing processes.
  • the printer has print heads that "fire” drops of ink from the print heads to the substrate in a very precise manner.
  • Multipass printing also called scanning printing, is a printing method where the printer head moves transverse above the substrate many time to generate an image. Such printers are slow but one small print head can generate a bigger image.
  • Industrial printers are generally based on a Single Pass printing method, which uses fixed printer heads, with a width that corresponds to the width of the printed media.
  • the printed substrate moves under the heads.
  • Such printers have a high capacity and they are equipped with fixed print heads that are aligned one after each other in the feeding direction. Each head prints one colour.
  • Such printers may be custom made for each application.
  • Figure 1a shows a single pass printer 35 comprising five digital print heads 30a-e, which are connected with ink pipes 32 to ink containers 31 that are filled with ink of different colours.
  • the ink heads are connected with digital data cables 33 or wireless to a digital control unit 34 that controls the application of the ink drops and the speed of the conveyor 21 that displaces the panel under the print heads with high precision in order to guarantee a high quality image comprising several colours.
  • a normal width of an industrial print head is about 6 cm and any lengths may be printed. Wide areas of 1-2 m may be printed with digital printers comprising several rows of print heads aligned side by side.
  • Number of dots per inch or DPI is used to define the resolution and the printing quality of a digital printer.
  • 300 DPI is generally sufficient to, for example print wood grains structures of the same quality presently used in conventional laminate floorings.
  • Industrial printers can print patterns with a resolution of 300 - 1000 DPI and even more and with a speed exceeding 60 m/min.
  • the print may be a "full print.” This means that the visible printed décor is mainly created by the ink pixels applied into the powder or surface layer.
  • the colour of a powder layer or a base colour has in such an embodiment in general a limited effect on the visible pattern or décor.
  • the print may also be a "part print".
  • the colour of another underlying layer is one of the colours that are visual in the final décor.
  • the area covered by printed pixels and the amount of ink that is used may be reduced and cost savings may be obtained due to lower use of ink and increased printing capacity compared to a full print design.
  • the print may be based on the CMYK colour principle. This is a 4-colour setup comprising cyan, magenta, yellow and black. Mixing these together will give a colour space/gamut, which is relatively small. To increase specific colour or the total gamut spot colours may be added. A spot colour may be any colour. The colours are mixed and controlled by a combination of software and hardware (print engine/print heads).
  • the print may be positioned in several dimensions horizontally and vertically in different depths. This may be used to create 3D effects when transparent fibres are used and to increase the wear resistance. No protective layers are needed that disturb the original design.
  • the DIP method may be used in all powder based materials, which may be cured after printing. However, the DIP method is especially suitable to be used when the powder comprises a mix of wood fibres, small hard wear resistant particles and a melamine formaldehyde resin.
  • the surface layer may also comprise thermoplastic material, for example, vinyl particles, which are applied in powder form on a substrate. This allows that the print may be injected in the vinyl powder particles. An improved design and increased wear resistance may be reached even in such materials.
  • a suitable printer head has to be used in order to obtain a high printing quality and speed in powder based layers and other layers as described above.
  • a printer head has several small nozzles that can shoot droplets of inks in a controlled way (Drop On Demand - DOD).
  • the size of each droplet may vary, dependant on ink type and head type, between normally 1-100 picolitres. It is possible to design print heads that may fire bigger drops up to 200 picolitres more.
  • Some printer heads can shoot different droplet sizes and they are able to print a greyscale. Other heads can only shoot one fixed droplet size.
  • Thermal printer head technology use print cartridges with a series of tiny chambers each containing a heater, all of which are constructed by photolithography. To eject a droplet from each chamber, a pulse of current is passed through the heating element causing a rapid vaporisation of the ink in the chamber to form a bubble, which causes a large pressure increase, propelling a droplet of ink out through the nozzle to the substrate.
  • Most consumer inkjet printers from companies including Canon, Hewlett-Packard, and Lexmark use thermal printer heads.
  • Piezoelectric/piezoelectric printer head technology Most commercial and industrial inkjet printer heads and some consumer printers such as those produced by Epson, use the Piezoelectric/piezoelectric printer head technology.
  • a piezoelectric material in an ink-filled chamber behind each nozzle is used instead of a heating element. When a voltage is applied, the piezoelectric material changes shape, which generates a pressure pulse in the fluid forcing a droplet of ink from the nozzle.
  • Piezoelectric (also called Piezo) inkjet allows a wider variety of inks than thermal inkjet, as there is no requirement for a volatile component, and no issue with kogation.
  • a lot of ink types may be used such as dye inks, solvent based inks, latex inks or UV curable inks.
  • Inks are generally individually mixed together by using colour pigments and several chemicals.
  • Water based inks comprising colour pigments are especially suitable and may provide a cost efficient printing method with high quality in many different materials.
  • Figures 1b - 1c shows forming of an embossed surface.
  • a wood grain structure WG is provided as a print P on a surface 2 as shown in figure 1b .
  • the surface is pressed against a matrix, generally an embossed steel plate, and embossed portions 17 that forms a basic embossing are formed as cavities or protrusions in the surface 2 as shown in figure 1c.
  • Figure 1d shows forming of an EIR surface.
  • the embossed portions 17 and the print P are formed in register and the embossed portions 17 are positioned above the printed portions P.
  • Figures 2a - c shows forming of an EIR surface in a laminate floor.
  • a matrix 40 which generally is a steel plate or a combination of a steel plate and an embossed paper layer, is pressed by a press table 24 against the printed surface 2 and an EIR surface 16 is formed after pressing as shown in figure 2c .
  • EIR provides a very advanced design, which is difficult to differentiate from real wood.
  • the technology is expensive and complicated since decorative papers or prints on a board must be in an accurate position in relation to embossed steel plates paper matrix or rollers that are used to create the embossed structure.
  • embossed surfaces and especially EIR surfaces may be produced in a way that is more cost efficient and that allows a change of the embossed structure in the same was as digital printing allows a change of the décor.
  • the digital application technology is mainly only used to obtain advantages related to the possibility to create a high-resolution image in a flexible way.
  • the other aspects of the technology mainly related to the possibility to apply a substance very precisely with a non-impact method, have not been fully utilized or developed, especially not in combination with substances that are not intended to create an image.
  • EP 2 108 524 describes a method in which protrusions are formed on a substrate with two or more digital prints provided on top of each other.
  • US 2013/0043211 describes a method, which comprises printing a curable substance or surface removing substance onto a panel in pre-defined pattern for creation an elevation on the panel at the pattern or removing a portion of the surface of the panel.
  • the print may be a digital print and the surface removing substance may be a liquid combined with a powder.
  • the substance is selected such that it reacts with the surface of the panel so as to remove a portion thereof.
  • the described methods are not suitable to be used in laminate and powder based floors that comprise thermosetting resins cured by heat and pressure. They are not suitable to create embossed structures in other surfaces such as wood and vinyl surface that are formed by pressing an upper protective surface layer.
  • EP 2 213 476 describes a method whereby a predetermined pattern may be printed on a carrier with curable liquid so as to form an embossing.
  • the main disadvantages with this method is that the curable liquid is applied on the lower side of the carrier that during pressing is in contact with the substrate.
  • the curable liquid must be bonded firmly to the carrier in order to be removed when the carrier is removed. This is a complicated operation since a carrier generally comprises a release agent and the liquid is very difficult to bond to the carrier in a fixed manner. It is not possible to use the same carrier for different embossed patterns.
  • embossed structures may be formed in a flexible way, preferably digitally, with pressure applied on the surface.
  • the objective of the invention is to provide a method to produce building panels with an embossed surface, which may be produced in a more flexible and cost efficient way and adapted during production to a printed décor that may be a digital print.
  • An embodiment of the invention is based on a main principle where a variable embossing is formed by digitally applied curable ink, also referred to as a mat ink, that after digital application and curing forms a matrix, hereafter referred to as an ink matrix, that is pressed against a substrate and that after curing of the substrate and removal of the ink matrix from the substrate forms an embossed structure on the substrate.
  • a variable embossing is formed by digitally applied curable ink, also referred to as a mat ink, that after digital application and curing forms a matrix, hereafter referred to as an ink matrix, that is pressed against a substrate and that after curing of the substrate and removal of the ink matrix from the substrate forms an embossed structure on the substrate.
  • a first aspect of the disclosure is a method of forming an embossed surface in a building panel.
  • the method comprises the steps of:
  • a method of forming an embossed surface in a building panel comprises the steps of:
  • the building panel may be a floor panel.
  • the surface layer may comprise a decorative layer with a print, preferably a digital print.
  • the cavity may be formed in register with the print.
  • the digital ink head may be a Piezo head.
  • the curable ink may be a polymer material, preferably a UV curing polymer material.
  • the method may further comprise the step of curing the curable ink to form the ink matrix.
  • the ink matrix may be formed on the surface layer of the building panel.
  • the ink matrix may be formed on a substrate, preferably a basic matrix that is pressed against the panel surface.
  • the method may be used to form embossed structures on a panel that comprises a basic embossing formed by conventional production methods and a complementary digitally formed embossing specially adapted to individual panels.
  • a second aspect of the disclosure is a set of building panels having a surface layer comprising a decorative layer and an embossed upper layer.
  • the decorative layer comprises a variable print and the embossed upper layer comprises a basic embossing being essential identical for the set of building panels and a variable embossing being distinguishable for each building panel.
  • the variable embossing is in register with the variable print.
  • variable embossing may be unique or individual for each building panel.
  • the building panels may be floor panels.
  • variable print may be a digital print.
  • the basic embossing may be formed in register with a basic design of the decorative layer.
  • the basic design of the decorative layer may be a print, preferably a digital print.
  • the building panels may be configured with an embossed surface that allows a floor area of more than about 10 m2, preferably more than about 15 m2, to be installed where all building panels have different surface structures. For example, more than 20 different building panels, each with a different surface structure, may be produced.
  • the basic principles may also be used to apply an embossed structure on an upper side of a foil that during pressing is in contact with a press table.
  • the embossed structure is pressed into the foil during pressing and the foil is automatically formed as a press matrix that creates depressions in a panel surface where digitally applied curable ink, or mat ink, forms an ink matrix.
  • the advantage is that the foil is easy to remove from the pressed surface and that the surface structure of the foil may be used to form a part of the basic embossing even on surface portions, which are formed by the ink matrix.
  • a third aspect of the disclosure is a method of forming a matrix for forming an embossed surface on a building panel, comprising the steps:
  • the curable ink may be a polymer material, preferably a UV curing polymer material.
  • the method may further comprise the step of curing the ink matrix, preferably to a hard substance.
  • a fourth aspect of the disclosure is a matrix for forming an embossed surface on a building panel produced according to the third aspect of the disclosure.
  • a method of forming an embossed surface on a building panel comprises the steps defined in appended claim 1.
  • the building panel may be a floor panel.
  • the surface layer may comprise a decorative layer with a print, preferably a digital print.
  • the cavity may be in register with the print.
  • the digital ink head may be a Piezo head.
  • the curable ink may be a polymer material, preferably a UV curing polymer material.
  • the method may further comprise curing the ink matrix, preferably to a hard substance.
  • the foil may be a metal foil, preferably aluminium foil, or plastic foil.
  • the surface layer of the building panel may comprise a thermosetting resin, preferably a melamine formaldehyde resin.
  • a sixth aspect of the disclosure is a basic matrix for forming an embossing on a surface of a building panel, wherein the basic matrix is an aluminium or plastic foil or a coated paper, the basic matrix comprising:
  • the production methods according to embodiments of the invention make it possible to produce very advanced decorative patterns which may be formed with a variable in register embossing that may be in register with a digitally applied décor and without repetition effects.
  • Figure 3a-3f shows various production steps outside the scope of the present invention that may be used to form a variable embossed in register surface in a laminate floor or any other floor where the surface is formed by pressing and preferably also by increased temperature.
  • the method is based on a main principle where a variable embossing is formed by digitally applied curable ink or substance, also referred to as a mat ink, that after application and curing forms an matrix that is pressed against a substrate, hereafter referred to as an ink matrix.
  • Figure 3a shows laminate panels 1a, 1b comprising a transparent overlay 18 and a decorative paper 5 having a décor that are applied on a HDF core 3.
  • the laminate panels 1a, 1b comprise a backing layer 4 to balance the panel.
  • a print P1 that may be a part of a wood grain structure, is printed by a digital printer on a first panel 1a and a different print P2 is printed digitally on the second panel 1b.
  • Figure 3f shows the panels 1a and 1b after pressing.
  • a part of the surface structure of the two panels, i.e. panel 1a and 1b, is produced with the same basic matrix 40 ( fig 3c ) that forms a basic embossing 17.
  • This basic embossing is combined with a variable embossing 19a, 19b formed during pressing by an ink matrix 41a, 41b.
  • the ink matrix is formed by a digitally applied curable ink 25a, 25b, also called a mat ink, that prior to the pressing step is cured to a hard substance.
  • Figure 3b shows that two different curable ink patterns 25a, 25b are applied in register on the two different prints P1, P2.
  • the curable ink 25a, 25b protrudes vertically upwards from the panel surface.
  • the vertical extension of the curable ink may be in the range of 0.05 to 0.5 mm, for example about 0.1 mm which corresponds to a normal embossing depth of a wood grain structure.
  • Figure 3c shows the curable ink 25a, 25b when it is cured to a hard ink matrix 41a, 41bThe panels are thereafter moved into a press with a press table 24.
  • Figure 3d shows that the panels and the ink matrix 41a, 41b is pressed and heated such that the press matrix 41a, 41b is pressed into the panel surface and the panel surface is cured preferably under high heat and pressure similar to the pressing parameters used in laminate and powder based floors or LVT floors.
  • the method may also be used to form structures in wood and ceramic material.
  • Figure 3e shows that when the panels leave the press they comprise an ink matrix 41a, 41b above the print P1, P2.
  • Figure 3f shows that the ink matrix is thereafter removed and cavities 37a, 37b are formed above the prints P1, P2.
  • the cavities 37a, 37b form a part of a variable embossing 19a, 19b.
  • the panels have an embossed surface comprising a basic embossing 17 and a variable embossing 19a, 19b.
  • the variable embossing is in register with the variable digital prints P1, P2.
  • UV curing polymers are preferred. They include a wide range of polymer materials such as acrylics, acrylates, epoxies, polyurethanes, polyesters and silicones. These materials may be applied as ink with a piezo print head. They may be designed such that they do not bond to a thermosetting or thermoplastic surface, such as melamine formaldehyde resin and vinyl, and they have sufficient strength and heat resistance which is needed to form a structured surface in the production steps that are generally used to produces the above mentioned floor types. Release agents may be included in the curable ink, in the surface or as a separate printing application prior to the curable ink coating.
  • curable inks may be produced to meet the specific requirements of different surface materials by, for example combining aliphatic- or aromatic, acrylic terminated, polyurethane technology with polyester and/or acrylic materials.
  • Water based UV curing dispersions can be formulated into transparent and/or pigmented low and high gloss curable inks and coatings.
  • a digital curable ink coating unit 36 comprising a fixed digital printing head 30, applies a preferably transparent curable ink on the overlay paper 18.
  • the digital application is made without any contact with the overlay and the curable ink 25 is applied as drops, which are fired from the digital print head 30 towards the surface.
  • a UV curing oven 23 with ultra violet light is located preferably after the digital coating unit 36 in the feeding direction and may provide a practically instant curing within a few seconds of the curable ink 25 into an ink matrix 41, especially if, for example a UV cured polyurethane coating with an appropriate photo polymerization initiator is used.
  • the digital coating head 30, which preferably is a piezo head, has preferably a capacity to fire drops with a drop size of about 50 - 200 picolitres or more. Several rows of print heads may be used. The drops are preferably positioned such that they overlap or join with each other.
  • the UV curable ink is preferably a water based UV curable polyurethane substance with a viscosity that is adapted to the digital coating head 30.
  • Water-based polyurethane dispersions are preferred as curable ink used in the digital coating head. They are environmental friendly and technically superior to similar solvent-based coatings. They are, for example free of isocyanate and have a zero or a very low volatile organic content. They have superior properties related to hardness, stain and abrasion resistance, impact strength and temperature.
  • Polyurethane dispersions are fully reacted polyurethane/polyureas of small and discrete polymer particles and such particles may be produced with a size of about 0.01-5.0 microns and may therefore be handled in a digital Piezo print head or other similar heads. They may have 20 -70% solid content and a wide range of layers with different hardness may be produced with a digital coating method. Polyurethane dispersions may be blended with, for example acrylic emulsions and other emulsions in order to reduce costs.
  • the curable ink is stored in liquid form in a coating container 31, which is connected to the digital ink head 30 with a coat-feeding pipe 32.
  • a digital control unit connected to the ink head and the conveyor with data cables 33 controls the drop size and the speed of a conveyor 21 that displaces the panel 1 in relation to the digital ink head 30.
  • the curable ink application equipment 36 is preferably connected to a digital printer in order to coordinate the curable ink pattern with the desired décor made by the digital printer.
  • Such a digital coating unit 36 is much more cost efficient than a digital printer since much larger drops may be fired and this gives an increased capacity and less problems with the channels in the head that may be sealed by larger particle in the ink when the printer works with high resolution and small drops.
  • Each ink head may be designed to apply one layer only and there is no need to coordinate different print heads as in conventional digital printing.
  • the coating line may be very compact and the UV curing oven may be located close to the digital coating unit.
  • the coating may be very precise.
  • Surfaces comprising paper, powder, vinyl, a thermoplastic film and similar may be digitally coated in order form an advanced ink matrix 41.
  • a powder layer is preferably stabilized with IR lamps, hot air or pre-pressing prior to the application of the curable ink and this allows that the curable ink may be applied on a rather hard but still uncured powder surface.
  • the powder may comprise wood fibres or particles, a binder, preferably a thermosetting binder, and preferably also wear resistant particles.
  • Digital coating equipment may of course have several ink heads and a panel may be displaced under the ink heads several times.
  • the digital coating may be applied on individual panels or on a large sheet that after the coating is divided into several panels.
  • the ink matrix particles 41 may be removed in many ways, for example by vacuum, air pressure, brushes, increased temperature, chemically, with water, etc. Curable ink may be used that after the initial pressing and heating changes its structure into smaller particles.
  • Very small amounts may be used to provide an advanced DVEIR surface. Only 5-10% of the surface may be covered to an average depth of 0.05 to 0.5 mm, for example 0.1 mm and this means that only 5-10 g/m2 may be needed.
  • the removed ink matrix material may be recycled and used as filler in other applications.
  • the method may be used to form deep embossing with a depth of about 0,5 mm and more especially if several layers of curable ink are applied.
  • Figure 4b shows curable ink coating on a substrate such as a structured release paper or film 40 where the curable ink 25 is applied on the substrate 40 and not on the panel surface.
  • This transfer method is preferred when a basic embossing is created by a foil and not by a press plate.
  • the pressure may be applied by a press table 24 as shown or a press cylinder (not shown).
  • Figure 4c shows that the curable ink may be applied on a pressing cylinder or roller 40.
  • the curable ink 25 may be fixedly connected to the substrate or just transferred to the surface by the substrate where it in a following step is removed from the surface.
  • Figures 5a - 5d show a DVEIR method according to the present invention that may be used to provide embossed structures in practically all type of flooring materials in a very simple and cost efficient way.
  • Figures 5a, b show that a substrate such as a first basic matrix material 40a, that preferably forms a part of the basic microstructure.
  • the first basic matrix material 40a is preferably transported through a press 24 from one in feeding roller 22a to an out feeding roller 22b.
  • the first basic matrix material 40a may be an aluminium or plastic foil, or coated and embossed release paper and similar. Such matrix materials are generally used in the flooring industry and may provide a variety of microstructures with different gloss levels.
  • a second basic matrix 40b may also be used and may be a conventional press plate.
  • a curable ink 25 is applied on the rear side of the first basic matrix 40a by a digital coating unit 36 and may be cured by a UV curing oven 23 to an ink matrix 41.
  • Figure 5c shows that the second basic matrix 40b on the press table 24 presses against the first basic matrix 40a and against the ink matrix 41 on the first matrix 40a.
  • Figure 5d shows the surface structure when the first basic matrix 40a with the ink matrix 41 is removed.
  • a variable embossing 19 is formed as a cavity 37 by the ink matrix 41 in the surface 2 and in register with the print P.
  • the surface comprises also a basic microstructure 17a and a basic embossed structure 17b formed by the first and/or the second basic matrix 40a, 40b.
  • This method may be used to form a basic matrix 40a that may be supplied in roles or sheets and used for forming an embossed surface on a building panel.
  • the basic matrix 40a may be an aluminium or plastic foil or a coated paper as described above.
  • the basic matrix comprises a lower part intended to be pressed and released from a the panel surface and an upper part that is not in contact with the panel surface during pressing and that comprises protrusions 41 that during a pressing operation deforms the basic matrix 40a and created protrusions on the lower parts of the matrix that forms cavities 37 in the panel surface as shown in figures 5b and 5c .
  • the press and the press plate may be replaced by a hot and preferably pre structured roller.
  • Advanced DVEIR structures may be formed in thermoplastic materials such as floors with a vinyl surface layer.
  • Embodiments of the invention may also be used to produce conventional pre embossed release materials such as coated paper or foils that are supplied in rolls or sheets to a flooring factory in order to form an pressing matrix such as a matrix material.
  • a digital ink matrix may be formed on the upper and/or the lower side of the pre embossed materials. Even material of metal may be formed by etching where a digital ink head applies an ink that may be used to etch and form embossed surfaces.
  • the embossed structure may be formed only from the ink matrix and that no embossed press plate or first or second basic matrix forming a basic embossed structure has to be used.
  • the ink matrix arranged on a substrate may be used to replace a conventional embossed press plate.
  • the main principles of embodiments of the invention may also be used to form an embossed surface structure by applying small hard particles on a surface prior to the pressing step and removing the particles after pressing.
  • the particles may be positioned digitally.
  • a binder pattern or image may be formed digitally on a substrate, by an ink head that only applies a binder that may comprise water.
  • the substrate may be a powder layer, an overlay paper, or a thermoplastic foil or similar.
  • the liquid binder may connect the particles directly or indirectly by reacting with a binder such as, for example melamine formaldehyde resin that may be included in the surface or in the hard particles.
  • the small hard particles are scattered randomly by a scattering device over the binder pattern.
  • the binder connects some particles that form the same pattern as the liquid binder while other non-bonded particles are removed by, for example airstreams.
  • the remaining particles form a protruding structure similar to the cured curable ink.
  • the substrate is thereafter pressed and cured and the hard particles are pressed into the surface.
  • the hard particles are thereafter removed, for example mechanically, by heat, air streams, or chemically.
  • the hard particles may be sand, aluminium oxide or other minerals. Even salt or sugar may be used and a final removal may be accomplished by melting the particles with water.
  • the binder may be applied digitally prior or after the scattering of the hard particles.
  • a digital image was applied in a powder based surface layer of a panel comprising a HDF board material as a core.
  • the powder was a mix of wood fibres (40%), aluminium particles (10%) and melamine formaldehyde resin powder (50%).
  • the image was created and injected into the powder with a single pass printer comprising 5 fixed Piezo print heads.
  • the ink was a water-based ink comprising colour pigments.
  • a piezo print head with a drop size of 30 picolitres was used to apply a matrix pattern with curable ink comprising a water based UV cured polyurethane (PU) on a rear side of an aluminium foil.
  • the PU matrix pattern was the same as the wood grain structure of the digital image.
  • the PU matrix pattern was cured in a UV oven to an ink matrix.
  • the aluminium foil was positioned above the digital print such that the ink matrix and the digital image were in register with each other.
  • the panel and the aluminium foil with the ink matrix were pressed in a press with a pressure of 40 kg/cm2, during 30 seconds and heated to 160 degrees Celsius.
  • the aluminium matrix was removed after pressing.
  • a perfect embossed in register surface design was obtained with a basic gloss level that corresponded to the surface structure of the aluminium foil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Ceramic Engineering (AREA)
  • Floor Finish (AREA)
  • Laminated Bodies (AREA)

Claims (14)

  1. Procédé de formation d'une surface gaufrée (16) sur un panneau de construction (1), comprenant les étapes consistant à :
    • fournir un substrat (40),
    • former une matrice d'encre (41) ayant une extension horizontale et verticale en appliquant une encre durcissable (25) sur une partie supérieure du substrat (40) au moyen d'une tête encreuse numérique (30),
    • former une cavité (37) dans une couche de surface (2) du panneau de construction (1) en pressant une partie inférieure du substrat et la matrice d'encre (41) située sur la partie supérieure du substrat contre la couche de surface (2) du panneau de construction (1), ce qui forme une surface gaufrée (16) du panneau de construction (1), ladite matrice d'encre (41) étant durcie avant pressage, et
    • retirer le substrat avec la matrice d'encre (41) de la surface gaufrée (16),
    dans lequel le substrat (40) est une feuille ou un papier antiadhésif structuré ou un film.
  2. Procédé selon la revendication 1, dans lequel le panneau de construction (1) est un panneau de plancher.
  3. Procédé selon la revendication 1 ou 2, dans lequel la couche de surface (2) comprend une couche décorative (5) avec une impression (P), de préférence une impression numérique (P).
  4. Procédé selon la revendication 3, dans lequel la cavité (37) est en alignement avec l'impression (P).
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel la tête encreuse numérique (30) est une tête piézoélectrique.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'encre durcissable (25) est un matériau polymère.
  7. Procédé selon la revendication 6, dans lequel l'encre durcissable (25) est un matériau polymère à durcissement UV.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel la matrice d'encre (41) est durcie en une substance dure.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel la feuille est une feuille métallique ou une feuille de plastique.
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel la feuille est une feuille d'aluminium.
  11. Procédé selon l'une quelconque des revendications précédentes, dans lequel la couche de surface (2) du panneau de construction (1) comprend une résine thermodurcissable, de préférence une résine de mélamine formaldéhyde.
  12. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'encre durcissable (25) est reliée fixement au substrat (40).
  13. Procédé selon l'une quelconque des revendications précédentes, dans lequel le substrat (40) est une première matrice de base (40a), et dans lequel une seconde matrice de base (40b) est pressée contre la première matrice de base (40a) et contre la matrice d'encre (41) sur la première matrice de base (40a).
  14. Procédé selon la revendication 13, dans lequel la seconde matrice de base (40b) est un plateau de presse classique.
EP19208901.9A 2012-07-17 2013-07-12 Surface gaufrée par voie numérique en registre Active EP3626478B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201261672573P 2012-07-17 2012-07-17
SE1250869 2012-07-17
PCT/SE2013/050900 WO2014014400A1 (fr) 2012-07-17 2013-07-12 Feuille supplémentaire
EP13820175.1A EP2877349B1 (fr) 2012-07-17 2013-07-12 Surface gaufrée par voie numérique par technique embossed-in-register

Related Parent Applications (1)

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EP13820175.1A Division EP2877349B1 (fr) 2012-07-17 2013-07-12 Surface gaufrée par voie numérique par technique embossed-in-register

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EP3626478A1 EP3626478A1 (fr) 2020-03-25
EP3626478B1 true EP3626478B1 (fr) 2023-06-14

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EP (2) EP2877349B1 (fr)
CN (1) CN108394228B (fr)
BR (1) BR112015000640B1 (fr)
RU (1) RU2642767C2 (fr)
WO (1) WO2014014400A1 (fr)

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EP3616939A1 (fr) * 2013-01-11 2020-03-04 Ceraloc Innovation AB Gaufrage numérique
GB2538492A (en) 2015-05-11 2016-11-23 Cook Medical Technologies Llc Aneurysm treatment assembly
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Publication number Publication date
RU2015103533A (ru) 2016-09-10
EP2877349A1 (fr) 2015-06-03
BR112015000640A2 (pt) 2021-08-24
BR112015000640B1 (pt) 2022-02-08
WO2014014400A9 (fr) 2014-03-20
CN108394228B (zh) 2020-07-10
CN108394228A (zh) 2018-08-14
WO2014014400A1 (fr) 2014-01-23
EP3626478A1 (fr) 2020-03-25
CN104684737A (zh) 2015-06-03
RU2642767C2 (ru) 2018-01-25
EP2877349A4 (fr) 2016-06-01
EP2877349B1 (fr) 2019-11-27

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